Travis-CI: Update PATH

We now can no longer re-use the provided path and need to give the
full PATH we want used now.
Signed-off-by: NTom Rini <trini@konsulko.com>

.travis.yml

@@ -52,7 +52,7 @@ install:
 
 env:
   global:
-    - PATH=/tmp/dtc:/tmp/qemu-install/bin:/tmp/uboot-test-hooks/bin:$PATH
+    - PATH=/tmp/dtc:/tmp/qemu-install/bin:/tmp/uboot-test-hooks/bin:/usr/bin:/bin
     - PYTHONPATH=/tmp/uboot-test-hooks/py/travis-ci
     - BUILD_DIR=build
     - HOSTCC="cc"